Publications by authors named "Costas Stamatis"

Background: The aim of the study was to use hybrid populations as well as island populations of the European brown hare (Lepus europaeus) to explore the effect of evolutionary events, such as the post-deglaciation translocations, spontaneous and human-mediated, local adaptation and the genetic drift in the shaping of the phylogeographic patterns of the species. For this purpose, we used molecular markers, both nuclear and mitochondrial, that are indicative for local adaptation as well as neutral markers to elucidate the patterns of population differentiation based on geographic isolation and the clade of origin. To broaden our analysis, we included data from our previous studies concerning mainland populations, to explore the genetic differentiation in the base of the geographic origin (mainland/island) of the populations.

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Nowadays, obesity is the greatest scourge worldwide, particularly for the developed countries and is a huge burden for the public health. Over the past decade, GWAS have revealed a number of genes associated with obesity. The fat mass and obesity associated (FTO) gene was the first one associated with obesity in a significant number of populations and recent meta-analysis studies confirm this association.

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European brown hare is a small game species spreading across Europe to Asia Minor, with important economic traits. Population genetics studies using mitochondrial DNA markers have revealed the existence of two major phylogeographic lineages, the European and the Anatolian. European lineage is further divided in the European type halpogroup and south-eastern European type halpogroup, while Anatolian consists only by the Anatolian/Middle Eastern type halpogroup.

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Netherton syndrome (OMIM #256500) is a rare but severe autosomal recessive form of ichthyosis that affects the skin, hair, and immune system. The identification of SPINK5, which encodes for the serine protease inhibitor LEKTI, as the gene responsible for Netherton syndrome, enabled the search for causative mutations in Netherton syndrome patients and families. However, information regarding these mutations and their association with the pathological Netherton syndrome phenotype is scarce.

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Article Synopsis
  • West Nile Virus (WNV) is a significant global cause of viral encephalitis, with 624 reported cases in Greece over the past five years, particularly affecting immunosuppressed individuals.
  • A study examining 105 WNV patients and 100 controls identified the protective gene DQA1*01:01 and the risk gene DQA1*01:02, along with associations between specific MHC class II genes and neuroinvasive disease.
  • The findings suggest that MHC class II genes play a role in the immune response to WNV, providing insights into risk factors for severe cases and supporting the need for further research on genetic susceptibility to the virus.
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The European brown hare (Lepus europaeus, Pallas 1778) is an important small game species in Europe. Due to its size and position in the food chain, as well as its life history, phenotypic variation and the relatively recent speciation events, brown hare plays an important role in the structure of various ecosystems and has emerged as an important species for population management and evolutionary studies. In order to identify informative SNPs for such studies, heart and liver tissues of three samples from the European lineage and a three-sample pool from the Anatolian lineage were subjected to RNA-Sequencing analysis.

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The major histocompatibility complex is one of the best studied systems in vertebrates providing evidence for the long-term action of selection. Here, we examined the intra- and inter-population genetic diversity of the MHC class II DRB locus in European brown hare (Lepus europaeus) and correlated the results with genetic variability already estimated from the MHC DQA locus and from maternally (mitochondrial DNA (mtDNA)) and biparentally (allozymes, microsatellites) inherited loci. L.

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A study was conducted in order to determine the occurrence of European Brown Hare Syndrome virus (EBHSV) in Denmark and possible relation between disease pathogenesis and Major Histocompatibility Complex (MHC) host genotype. Liver samples were examined from 170 brown hares (hunted, found sick or dead), collected between 2004 and 2009. Macroscopical and histopathological findings consistent with EBHS were detected in 24 (14.

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Article Synopsis
  • - Infectious diseases like Small Ruminant Lentivirus, Chlamydophila abortus, and Mycobacterium avium subsp. paratuberculosis significantly impact sheep economically, both directly and indirectly.
  • - This study examines the genetic variations of TLR9 and its mediator MyD88 in different sheep breeds to see how these variations relate to the sheep's immune response to these diseases.
  • - A specific genetic change (G to R at codon 520) in the TLR9 gene is linked to sheep being positive for Small Ruminant Lentivirus, suggesting it could affect the protein's structure and the sheep's vulnerability to the infection.
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  • The study investigates the genetic diversity of MHC (Major Histocompatibility Complex) in domestic pigs and their wild ancestor, the wild boar, focusing on two specific MHC loci: DQA and DRB1.
  • It finds that both species exhibit similar levels of nucleotide and amino acid variability, suggesting domestication did not reduce MHC diversity.
  • The research also reveals that while there is uniformity in polymorphism patterns across the loci, the PBR (peptide-binding region) shows significant variation and positive selection, particularly in the P4 and P6 binding pockets.
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  • The prevalence of obesity has significantly increased in western countries over the last three decades, leading to serious health and economic consequences.
  • The study investigates the genetic factors linked to obesity, focusing on two specific genes: the vitamin D receptor (VDR) and fat mass and obesity-associated (FTO) genes.
  • The findings indicate a significant association between the VDR TaqI 'T' allele and obesity, suggesting that this allele could be a potential target for future obesity treatments, whereas no link was found with the FTO polymorphism.
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We sequenced and analyzed the mitochondrial tRNA(Thr) and tRNA(Pro) genes from brown hare (Lepus europaeus) individuals of different geographic distribution and we investigated the role of various nucleotide substitutions that were detected. We compared these tRNAs with the respective available mitochondrial tRNA genes sequences within Lepus species and among mammals. The mutations that were detected represent specific and conserved polymorphisms that do not seem to affect the structural and functional features that are required for participation of tRNA molecules in mitochondrial protein synthesis.

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During the last decade, there has been a progressive accumulation of reports that connect the identification of specific mitochondrial tRNA gene mutations to severe disorders in human. As a result, mitochondrial tRNA genes and their products have emerged as novel and essential molecular markers for wide biochemical and genetic screenings among different human populations. So far, 139 pathogenic and 243 polymorphic mt tRNA mutations have been described and they have become the foreground of numerous case reports.

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Allozyme variability of 91 brown hares (Lepus europaeus) from seven regions in Greece was compared to existing data of Bulgarian populations to test the hypothesis of the occurrence ofspecific alleles in Greece, likely stemming from an isolated Late Pleistocene refugial population in the southern Balkans. This hypothesis is particularly suggested by some subfossil Late Pleistocene hare remains in Greece and the reported high mtDNA diversity in Greek hares. Allozymic diversity could be higher in Greek hares than in hares from neighboring regions as a result of the accumulation of variants in a long-lasting Pleistocene refugium.

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The RAPD method was used to assess the genetic differentiation of brown hare (Lepus europaeus) populations from Central Greece. Greek wild populations were compared with samples from Austria, Poland, Germany, France, and Bulgaria, as well as with reared/released hares to investigate the impact of the releases on the native populations' genetic structure. The absence of diagnostic bands distinguishing between L.

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